A modern-day mystic and yogi, Eric Putkonen focuses on nonduality, as seen in the "Direct Path" traditions (a.k.a. Pathless Path): Jnana Yoga, Advaita Vedanta, Zen Buddhism, etc. He can speak about this topic (including subtopics like mindfulness, being in the present moment, meditation, self-inquiry, enlightenment/awakening, etc.) or give a satsang at your event.
Satsang is a Sanskrit word; sat means true or being and sanga means company or gathering. More specifically, satsang means a gathering about the Truth of the essence of our Being...and being together with those who know the essence of their being. Usually there is a meditation, followed by a discourse or questions & answers, and then another meditation.
To learn more about Eric Putkonen and what he speaks about, see his website at Awaken to Life (http://www.awaken2life.org). It contains previously published articles and the podcast he hosts and produces (Out of Our Minds).